No but there's a couple subtlies here. If you are calling someone brave, the context is important. It can come off as condescending. Also coming out isn't an all or nothing thing, see here.
Also in this comic they aren't saying they are brave for coming out. They are saying they are brave for being cis. The underlying assumption there being that being cis or trans is a choice that one can be brave for.
Nope. But it might get old the nth time or if you didn't do something you think should of outed you.
It's kind of the paradox of being stealth. If you are successful no one notices. So you don't get feedback that you are successful.