I don't think I could have been polite to that. We are artists and we do what we feel is right. Sometimes it calls for a longarm, some times it calls for hand quilting, sometimes a meander/stippling, sometimes SID. But, it's our call.
I like to follow my Aunts advice. If you can't say something nice about someone or in this case, their quilts, then don't say anything at all. That person was totally rude and don't feel like you have to be polite back.
Don't let the ignorant people get to you.