If one researches the word irony you'll realize it has multiple definitions, ya fuckin high school dropouts.
You're not wrong, but it still doesn't make what you said previously, right due to none of the definitions supporting what you originally said haha. Maybe, " you are literally shit for brains" or "its beyond coincidence that you're name is shit for brains". As someone previously suggested " Shit for brains is an apt name"...or "your name is an apt description of you" I'd honestly use appropriate but it works either way.
I will say, there is irony in the fact that you still think you're right, regardless of looking up the definition. Even more so, you called someone pretentious and those who were correct high school dropouts. Though a small example, it's more surprising to me you completed HS, dipshit. Before you try to inflect whatever intelligence you think you might have, make sure you have a good understanding of said perceived knowledge you cunt.