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Alix Earle 's fans aren't playing with Braxton Berrios -- while the NFLer is seemingly trying to take a light approach about their recent split, the social media star's supporters are bashing him.

Here's the deal ... Berrios posted to Instagram Saturday for the first time since reports of the breakup came out last week -- sharing photos of himself walking by himself and with his fellow athletes. He captioned the post, "What did I miss?" ... a tongue-in-cheek wisecrack about all the media attention surrounding his relationship.

BB might be trying to play off the breakup ... but, social media ain't letting him -- because the comment section is flooded with a bunch of haters giving him the business.

Check out just a few of the roasts ... fans are calling him a "pick

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