Well, I’d like to think that there are some companies, if they support enough bad things that are ungodly, unpatriotic, or just plain greedy, shouldn’t be patronized by Christians or conservatives.
However, I guess maybe some may feel more strongly than others. As to that, I guess Romans 14 applies.
1 Him that is weak in the faith receive ye, but not to doubtful disputations.
2 For one believeth that he may eat all things: another, who is weak, eateth herbs.
3 Let not him that eateth despise him that eateth not; and let not him which eateth not judge him that eateth: for God hath received him.
4 Who art thou that judgest another man’s servant? to his own master he standeth or falleth. Yea, he shall be holden up: for God is able to make him stand.
5 One man esteemeth one day above another: another esteemeth every day alike. Let every man be fully persuaded in his own mind.
6 He that regardeth the day, regardeth it unto the Lord; and he that regardeth not the day, to the Lord he doth not regard it. He that eateth, eateth to the Lord, for he giveth God thanks; and he that eateth not, to the Lord he eateth not, and giveth God thanks.
7 For none of us liveth to himself, and no man dieth to himself.
8 For whether we live, we live unto the Lord; and whether we die, we die unto the Lord: whether we live therefore, or die, we are the Lord’s.
9 For to this end Christ both died, and rose, and revived, that he might be Lord both of the dead and living.
10 But why dost thou judge thy brother? or why dost thou set at nought thy brother? for we shall all stand before the judgment seat of Christ.
11 For it is written, As I live, saith the Lord, every knee shall bow to me, and every tongue shall confess to God.
12 So then every one of us shall give account of himself to God.
13 Let us not therefore judge one another any more: but judge this rather, that no man put a stumblingblock or an occasion to fall in his brother’s way.
14 I know, and am persuaded by the Lord Jesus, that there is nothing unclean of itself: but to him that esteemeth any thing to be unclean, to him it is unclean.
15 But if thy brother be grieved with thy meat, now walkest thou not charitably. Destroy not him with thy meat, for whom Christ died.
16 Let not then your good be evil spoken of:
17 For the kingdom of God is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost.
18 For he that in these things serveth Christ is acceptable to God, and approved of men.
19 Let us therefore follow after the things which make for peace, and things wherewith one may edify another.
20 For meat destroy not the work of God. All things indeed are pure; but it is evil for that man who eateth with offence.
21 It is good neither to eat flesh, nor to drink wine, nor any thing whereby thy brother stumbleth, or is offended, or is made weak.
22 Hast thou faith? have it to thyself before God. Happy is he that condemneth not himself in that thing which he alloweth.
23 And he that doubteth is damned if he eat, because he eateth not of faith: for whatsoever is not of faith is sin.
I think the passage speaks for itself and lays out a pretty good guideline which I don’t need to elaborate on as God has done it for me enough. I will say that the passage isn’t talking about the downright immoral or sinful stuff, but possible associations with sinful stuff. (i..e in part, they were mentioning meats offered to idols. The meat itself, often good and offered at a good price, wasn’t the problem mentioned, it was the issue of its association with the pagan gods that was causing trouble for some, especially new believers.) I believe meats offered to idols could, in a sense, by applied to money spent at a place that donates to the cause of sin. Spending money and fast food, a technology company, or an investment may not be evil in itself, but the association with it could cause problems for believers who may feel it is not right.