AITA for telling a clients boyfriend to leave?

I’m a 27yo (F) and I work as a piercer in a parlour. Recently, this girl came into the shop with her boyfriend and told me that she wanted to get both of her nipples pierced. As I was helping her pick out the jewellery she wanted for her piercings, I noticed that the entire time her boyfriend was just sulking behind her. He kept asking her if she really had to get her nipples pierced and was overall just creating an extremely awkward vibe.

When we went into the back so I could do the piercing, her boyfriend came along, which I don’t mind as many people bring someone along with them. As I was preparing everything, her boyfriend asked me If there was any way I could pierce her nipples without having to see her boobs. I told him that obviously she doesn’t have to just completely show me her boobs, but I still need to be able to see her nipples or how else would I be able to pierce her? He then started speaking to her quietly but I could still hear what he was saying. He was saying that he wasn’t comfortable with someone who wasn’t him seeing her in that way. I didn’t understand why he was being so insecure as this is just my job? I don’t view what I’m doing as sexual, i’m just simply giving someone a piercing

And then he asked me in these exact words if i’m “into girls” and I tried to make a lighthearted joke by asking him why that mattered and he just responded by asking if i’m going to be “turned on” by seeing his girlfriends boobs. His girlfriend kept telling him to shut up and just let me do the piercings so they can get it over with. I am straight and I’m engaged to a man but why does that even matter?? Even if I was into girls that doesn’t mean i’m going to just get turned on by piercing your girlfriends nipples??

I politely asked him if he would mind just standing outside while i done the piercings because I didn’t appreciate the questions he was asking me as they were extremely inappropriate. He then started accusing me of wanting to be alone with his girlfriend, he also spotted the engagement ring on my finger and said he felt sorry for whoever had to marry me knowing this is my job. I kept telling him to leave, he refused and started getting loud enough that he alerted several of my coworkers who all came in to see what was happening.

My coworkers were eventually able to get him to leave and his girlfriend decided that she would leave with him. I told her that I still had no problem doing the piercings for her but she said that she didn’t want to make the situation any worse and she apologised for the trouble and left. Afterwards my manager told me that I should have just ignored what he was saying and just done the piercings. I just felt that him asking me If i was gonna be turned on by piercing his girlfriend was extremely gross and inappropriate?? Most of my coworkers agreed that I should have just ignored what he was saying and not have made a big deal out of it but i’m honestly just so conflicted. AITA?