Well among the cases I’ve encountered are the following types:
Women lecturing me about gender equality and women’s rights when they see that my wife wears niqab.
Uncles who’ll pride themselves on being liberal and open minded but just have to say something when someone follows deen more strictly than they do and do things such as keeping a sunnah length beard, segregating their functions, being particular about halal/haram food. They’ll make it a point to say that the people they’re criticizing shouldn’t do what they do and provide their justifications.
In the case of the women who try to lecture me, I’ll either simply ignore them and carry on whatever I’m doing or I might actually open up the issue with them and discuss it. There have been cases where I’ve laughed at them and walk away.
In the case of the open minded people who only have something to criticize when people follow deen more strictly than them, I’ll remind them how they’re always saying that people should be able to do things the way they want as long as it’s not hurting anyone and these people are just doing things the way they like, so what’s the problem now. That has always ended that type of discussion so far.