This is coming from a person living in the US, so keep that in mind as i give this explanation, I’m also assuming this is a good faith question: oftentimes women of color are called masculine or manly in order to strip them of their femininity and insinuate that they are ugly because they dont fit very narrow, white beauty standards. It’s considered misogynistic and racist. Also in the US “minorities” usually refers to people of color, so someone reading your comment could read it to mean “yeah, this person is puerto Rican so she has a masculine body type”. I think the way your comment is worded looks a bit strange as well, like youre objectifying her on top of all that.
You saying that English is not your first language leads me to believe that those things weren’t your intention and can even make your comment look like you are being complimentary, but if someone didnt know that it definitely looks questionable/racist
Yeah, it can be hard to figure out just what to say when it comes to topics like this. It’s great that you’re trying to be sensitive and do better, though! I think when talking about women’s bodies especially its best to stay away from saying things like “masculine” or “skinny” or “fat”, even if youre not attaching negative meaning to it.