Frustrated about rude ring comments

So I hadn't seen my dad for ages. I had just gotten engaged and showed off my ring to him and he made the rudest remark. He's not a man of refinement or culture. Generally, he is blunt and often sounds rude.
Still, I am a very sensitive person and was extremely offended. I personally designed the ring setting after Belle Epoque and Edwardian aesthetics. He said that it looked fake because of the setting and like it was from a dime and penny store but that it was okay. Inside, I was thinking, "Of course, it's okay! Who are you to have a say in it!" He saw that I was annoyed and said it was because it was unusual and too grand.

He's generally a man of bad taste in my opinion. He says that the Palace of Versailles and many other beautiful places are hideous. Etc. The list would go on forever. He offered my stepmom money rather an engagement ring. Moreover, my mom had to pick a smaller and bad quality diamond because he didn't want to buy her the one she picked. She didn't even ask for a very expensive one. He's probably a better father than he is a husband.

Knowing this, I'm still very bothered and want to confront him in a more aggressive manner. It's only 2.5ct, but when it came in the mail, my bf said that the diamond looked so big that it looked fake. My fiance isn't callous enough to keep saying that unlike my father.

2.5ct isn't even that big. Normal people have 3-5ct rings.

Am I the only one getting this flak?