I accidentally said something bad about a guy in the gym and now I feel like I did something wrong. Opinions ?

So i’m new in my gym and made a few « friends » in the gym. Today one of my friend said he’s glad he chose muay thai over MMA because it’s « softer », and i responded that he should try sparring with [the guy] because he hits really hard and then tell me again that muay thai is soft.

Problem is my coach heard it and started a speech about hitting new comers hard and said that if it happens we should go tell him etc. I cringed a lot and then tried to temper my coach by saying that [the guy] still let new people work. But i know [the guy], who is a veteran of the gym, heard everything.

Now I feel like a snitch and feel bad and anxious about the whole thing. So i’m asking you guys : am I making a big deal out of nothing or not ?