Try reading my comment to Frank about that (#61). Yes, I can and do say "No, thanks." Most accept that, but not all. Some will pester and pester. I've even had a few who escalated to the point of anger.
It's not so much to ask ppl to be happy with what they've chosen, and leave others to be happy with their own choices. After all, if you love wearing jeans, do you feel the need to approach ppl not wearing jeans and tell them how great they are, how well they fit, and invite them to wear jeans too? If they say "No, thanks" is it okay to beseech them to at least TRY them? Just be happy with your pants and move on.