"stupid" and "dumb" really aren't good CWs for personal, emotional stuff, shitposts or anything else. I totally get why people are using these, but maybe reconsider the specific words and ableist concept?

If you really want to CW your emotions as "devaluated in an ableist way" (I get it), there's "whiny", for example. (In reality, there is nothing wrong with being whiny, of course.)
If you're semi-shitposting, there's "silly" and tons of more graphic descriptions.