my thoughts were a little different
I do not think you are too sensitive
real fast riders do not insult small bikes
they might call them 'small' but with a smile and respect
the crids I dislike are the weekend warriers, the ones that think they are oh so hot and oh so cool, but are only somewhat fast because they switch off their brains and ride with a crowbar plus they seldom are knowledgeable,
if you can not outrace them to 'earn' their respect you got to shake off their 'big+bad mouthing'
beat them with their own weapons

when I started off-roading self-mockery und over time understatment were my best defence
still use it
and I still have a ball, when they look down on and pitty my XLR200 until it passes their 610, 620, 640
yes, Barbara, a 17horse pitbike can do that, but it takes a lot of sweat, bruises and tears during the years of learning
