I asked him to remove a girl that's always posting herself in bikinis and tight tiny work out gears?

I asked my boyfriend to remove a girl that is always posting bikini pics like she's single and this was the conversation that happened:

Me: can you unfollow her? (Shows screenshot) She's gross and attention seeking.

Him: Ok, I will

Me: Thanks I appreciate it , love you 😘

Him: love U too but can you tell me something you don't actually think she's gross? U just said that cause you're angry.

Me: Course I do

Me: A girl that says take a photo of my ass while I pose and posts it is attention seeking and gross

Me: If you don't think so. I'll do it then.

Him: You already have done that Missy.

Him: You've twerked on Snapchat haha

Me: What I did on Snapchat stories was deliberately for attention from guys. I fucking know what I'm doing. Just like she does. We girls are not stupid

Me: If I stand Infront of the beach and say take a photo from behind and make sure my ass can be seen. I know exactly what I'm doing.

Me: If I take a photo in a bra that's low cut. I know exactly what I'm doing.

Him: Yes yes I know. Its ok u dont need to blow me up babe

He then said "talk later"

Why couldn't he just leave it at love U too?

Is this a red flag?

Updates
9 mo
(the Snapchat posts he was referring to were from my single days)
Updates
9 mo
The woman he's watching IS MARRIED. I checked his Instagram (the husband's) he doesn't have one single photo of her in a bikini or tiny see through workout gear, which, to me, shows he doesn't want the world seeing that. But she splashes them all over her Instagram account like she's single and makes her Instagram public
I asked him to remove a girl that's always posting herself in bikinis and tight tiny work out gears?
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