Do you find it to be a red flag for a man in a relationship to be consistently liking other women’s pictures?

I’ve been dating a man for about 3 months now and it recently got serious/we became exclusive. I try not to overthink social media actions, but I’ve begun to notice a pattern. I’ve had numerous womens’ accounts (on Instagram) show up in my suggested as he follows them, and out of curiosity I clicked on a few.

After viewing the accounts, I saw that he’s consistently liking their photos, including somewhat scandalous ones (I.e. bikini photos, ones showing off body, etc). Obviously I don’t care if he likes female friends’ photos, but this seems different. I believe many of these women he may have met through dating apps before we were exclusive. The issue is that he still continues to like all of their photos.

Am I wrong for feeling a bit upset about this? I did (politely) ask him why and he said that he just likes a bunch of pictures on his feed without thinking about it. It feels a bit childish to me/I feel like he should not be interacting (even if it’s just a simple photo like) with women he formerly had romantic interest in (even if they never dated). Appreciate any input!