Those who have seen the movie The Ringer, did you find it tasteless?

IMDB page for the movie
Summary of the movie for those who haven’t seen it:
A non-handicapped man pretends to be handicapped in order to win the Special Olympics for the prize money.
A lot of the cast are people with real-life mental disabilites and handicaps.

My sister is severely disabled, so I’m pretty protective of the disabled community.. I don’t tolerate jokes or insults about them I’m not a fan of the word “retarded” used in a context that’s not medically correct either..

I’m watching this movie now, and I can’t decide if I like it or hate it.
I feel like it’s horribly offensive and is using their mental disabilities as joke.
But at the same time, I know nobody would let them film the movie if they weren’t happy.. so I know these people had to have had the time of their lives filming this.

Am I just over-thinking the movie or is it tasteless?