Ask HN: How do you deal with overconfident and mediocre individuals?

I have a high bar for expressing absolute confidence for something (ie knowledge in a field or proficiency in a language) and am continuously surprised by people who claim mastery of something/that they are a natural at something, but in reality are quite mediocre, or above average at best. Furthermore, the same individuals tend to put down others who are more humble/less confident in their skills, directly or subtly.

It infuriates me when these individuals subtly bring down others, but I am unsure how to approach it - directly, indirectly, or just ignore it and focus on my own work and goals.

I also anticipate that I’ll be told the only way is for me to be more vocally confident in myself, but that is not my natures and I have little appetite in continuing the status quo.