If you smart enough person and have been into the software industry for quite a while you will most likely notice the ugliness of it and recognize the beauty of not-so-mainstream "experimental" languages and tools, some of them you might enjoy a lot.
Is it a good idea to mention it on a mainstream-tech job interview straight ahead or is it better to act like you love the mainsteam (Java/NodeJS/PHP/Python (etc)) and think it's the best language/tool out there?
@shegeley I think that, no matter the topic or the company, it's always the best idea to just be honest and open. Asking doesn't hurt (mostly), and if it does, it's probably not a good employer to begin with.
In your case, you can definitely say, for example, that you find Python ugly. The company will either say "We don't care, we need Python" (and then you'll decide if you want to proceed) or "We're open to the alternatives", at which point, you've won :)