"exaggerated font sizes" Emphasis on the sizes.
Sometimes it is appropriate to use a larger font, like when you're wishing someone a Happy Birthday!
But typing in ALL CAPS, is considered shouting, so forum regulars (on most forums around the net) will complain vociferously when you write in all capital letters.
Its worse, of course, is to combine ALL CAPS, with Bold ALL CAPS, and then increase the size! ALL CAPS
And if you really want to irk people, add some color: ALL CAPS
You avoided all of those with your last post, so you're set.