It's not wrong at all. First, examine the specifics of what I'm arguing--namely, that some people intentionally gravitate toward low tier in order to hide behind an inability to win, and they try to shame people who choose other characters while focusing on "moral victories." It's a counterproductive strategy, and it deserves to be called out, so within that specific context those people are indeed cowardly. Choosing a character you like that just happens to be low tier is an entirely different phenomenon. As I mentioned to the guy above, you should go for it!
I'd further like to engage with the notion that low-tier players are "better" than the people who beat them because they know the system better. This is very, very difficult to prove, firstly. More importantly, I see it as a potentially problematic way of thinking. The ultimate objective metric for any fighting game player is wins and losses. Matches are played out on the screen, not in the form of a multiple choice quiz on who knows mechanics the best. Do certain top tiers allow for significantly less skilled players to win? Absolutely. It's incredibly difficult to parse the difference, though, without further encouraging people who want to hide behind bad characters instead of finding a character they might actually enjoy more, not to mention possibly winning in the process.