Your post is very broad and mixes different criteria: Popularity, aesthetics, usability, speed etc. You argue that people like different languages; some people irrationally like some and dislike others; not all programmers apply the same evaluation criteria.

The problem is - all of these are old arguments, and calls for open-mindedness are nothing new. I'd find it much more interesting if you talked about a technical, concrete example how one can benefit from open-mindedness. E.g.: Decouple your modules so you can use different languages side-by-side; write the same code in two languages so you can battle-test your implementations etc.