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Joe Biden 's taking a presidential break ... chilling on a beach in Delaware -- and, people online aren't happy about it.

The 46th POTUS hit Rehoboth Beach -- a favorite spot of the Biden clan -- for a little R&R Saturday ... and, camera crews caught him kicking his feet up underneath a beach umbrella. Play video content

Not a lot happening in this vid if we're being honest ... and, that's exactly the problem -- 'cause people online are taking Joe to task for sleeping on the job.

X users are taking to the platform to vent about how Biden's taking a vacation with just months left during his presidency ... and, many conservative commentators are asking who exactly's at the country's helm right now. Getty

It's a line many Republicans have parroted in recent weeks after Bi

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