Only if it's the Correct opinion. Try being a julia user but thinking julia kinda sucks. That's a much more hostile experience than being a c++ dev and thinking c++ kinda sucks.
Some people feel that they should get to act like a prick, while everyone else should be humble and courteous.
If you act like a decent person person, there's no problem pointing out weak points in Julia and request help to work around it. If your only input is "Julia kinda sucks", what kind of feedback do you feel that you are owed?