There is a lot of colorful talk in your post and replies about hipster behavior and hip languages. A successful IT career has nothing to do with where you drink

There is a lot of colorful talk in your post and replies about hipster behavior and hip languages. A successful IT career has nothing to do with where you drink coffee, which brand of personal computer you use, and whether your clothing has facilities for keeping the wind off your face. What really matters is you can deliver value to a business. Yes some companies (or hiring mangers there) don't value that and it is all about ridiculous signalling i.e. what frameworks are cool vs uncool and other such nonsense. In my experience (my Australian-European experience anyway) most companies just want developers who can solve problems reasonably quickly, fit in with a team, and appreciate quality. Yes some jobs may require specific experience, like they want extensive React experience for example. If this they are this fussy they should pay more. Most companies will happily see evidence that you know JS well. My advice is to disregard anything a person who calls you a 'useless lamer' has to say as this person is probably not an authority and needs to grow up. Instead keep learning on the intersection of what interests you and what will help you get hired. Go to more interviews and take note of the questions they ask you. As an example I was often asked about SOLID principles in interviews, so I took time to learn it. Actually it was pretty useful and I use SOLID in code review discussions now. (This is just an example and I am no sure it will apply to Javascript) Learning OO is a good idea. C# and Java are probably to most popular and are quite easy to transition to from JS. In a nutshell fuck this douchbag who called you a lamer. I'd listen to a donkey's opinion before I take this guy seriously. Go to more interviews, find out where your knowledge is missing and fill it in. Finally don't lie on your CV, you won't need to.