At least you're not alone in this one - it's so common that e.g. anyone registering anything (domains etc.) with mastodon really ought to keep it in mine and register the equivalent with mastadon.
Hey thank you for the reply, I'm also sorry. I usually have better grace than correcting random strangers on their spelling, but I've shown weakness on this day. :)
I think the funniest one I struggle with all the time is “parallel.” I always think it should be “paralell.” I put the two parallel lines in the wrong spot in the word!