I'm not intentionally insulting people, but sure I can see why it is insulting. Still, it is an opinion. Tell me that you voted me down for being insulting and I won't call bs on that, this guy said I framed what I said as fact.
You told people they are incapable of boredom while 'really exercising'. You were not talking about whether you were bored. You were telling people what they feel. You were making a factual statement.
It was insulting for you to call people wrong on a factual matter where they have experience and you don't. Then you compounded the problem by arguing about it.
You can't just call something an opinion to deflect criticism.