Of course languages are different. Some are better for some things than others. Choosing a language without knowledge of its tradeoffs is not a vary good idea.
The issue the parent is comments is judging someone based on their use of a language without knowing if that person has any knowledge of the tradeoffs is doing them a disservice. Spewing that judgement on the internet is actively harmful.
If you only know a single programming language, you should have some inner doubts, no matter what that language is. This is healthy.