We’ve all opened emails that are clearly templates. The dead giveaway the sender didn’t type out every word in their personal message: the styling is different. Maybe some words are a different size. Or maybe it’s the font. The mismatched look is insulting.
The point I’m trying to make is: The email you got was a generic template and they filled in the sections — only they didn’t realize that many email services like Gmail preserve styling. As the receiver, it feels like a slap in the face to get a copy-paste-and-fill-in-the-blank job.