The reason I say “no offense” is to indicate to you that my intention is something other than offending you.
For example “no offense but your breath stinks. We should stop and get some mouthwash before we get to the party”
I’m not saying that to make a person feel bad, though they will likely feel bad after I say it. I’m saying it to help them.
I’m autistic, man. If the autistic kid can figure this stuff out so can you. No offense, but maybe you should consider things you don’t understand more deeply before tossing them in the waste bin.