I choose to be courteous to others (but I do it for myself). I don't think it really matters what the other person thinks about it. They might think I'm old fashioned or cheesy, they might be offended or they might even be grateful. I'm not sure that it matters to me. I have standards that I hold myself to and nothing that anyone else thinks about those standards really matters to me.
It works the other way around too. If someone thinks that something I do is rude, or stupid or whatever...I don't really care about that either.
my 2 cents