No need to apologize. The phrase "mentally challenged" is used by many people, with different meanings and intentions. Rather than jump on you straight away, I wanted to be sure of what you meant.

As someone on the spectrum, I like hearing/reading what other people think about it and their associations, etc. I prefer to think of myself as just having a differently wired brain (i.e. there are some things I excel at that others don't, and vice versa).