I think we show respect for anything anyone else holds sacred or important by not disrespecting it. It could be a religious object or a national symbol such as their flag or even a picture of their ruler. We don't have to show it deference and bow down to whatever it is, but openly tearing up, defacing, or burning is wrong.
I've seen guys practically worship their cars, but that doesn't mean I have to. I can say "it's nice" and go on. If I really think it is a stupid car I can hold that opinion to myself until such time as it is asked for, or he tries to convince me his car is the epitome of all that is good. In such case I can let him know that I don't have the same opinion and his car is a POS, but he is still welcome to think it is the best thing ever built.
If he is a really good friend there is then a friendly banter back and forth and we will forever tease each other about our beliefs.
