How rude
Despite their near-identical appearances, seals and sea lions are completely different. You can tell one from the other by the way they travel on land (seals flop on their bellies while sea lions use their flippers to move around). Also, seals are cute and adorable while sea lions are the jerks of the sea.
The OP got a taste of a sea lion’s unfiltered jerkiness. A pack of sea lions approached this guy while he was out at sea and started bumping into him for seemingly no reason. If he was getting too deep into their territory and wanted to shoo him away, they could’ve asked.