Smile, thanks for clarifying your position. Let me propose a difference:
1) in case of price and quality, there are established halochos to what degree one should favor the Jewish store. And if the store owner is T’Ch or/and an Ehrliche Yid, I am sure people will push it further. Still, if I prfer to feed my kids fresh food, I’ll go where it is.
2) in your case of a chumra, you have a halachik balance between being machmir l’Hashem and being supportive of another Yid. As many say, as Hashem also wants you to support the Yid, the halachik decision is to favor the Yid v. a chumra that becomes simply inapplicable in this case. You literally have nothing to lose – the Yid is happy, and Hashem is happy. Why aren’t you!?
This is just a milder form of a chosid shoteh who would not touch a woman to save her from drowning. Evidently, Hashem wants him to touch her in this case, so he has nothing to be machmir about.