Yesterday on a completly crammed 350/2 the bloke sat opposite me had his rucksack between his feet for the whole journey (3+ hours). He put a bunch of flowers in the rack but for some obscure reason wouldn't do the same with his "luggage", despite never needing to use it?
Last time on a 2+2 350 I sat in a table aisle seat. The opposite passenger had his laptop open and completely on "my side" of the table for the full journey. Fortunately I was only reading a paper, but it still didn't stop him opening his screen to the extent of actually overlapping beyond "my side" of the table. Some people are simply rude, I nearly said something, but bit my lip (for a change).