Is OTHER wrong in the post ? POST : For lunch (30 min)  I usually go to this cafeteria. I chose the earliest lunch since it's not busy during that time. I get my lunch go to the condiment stand and place my plate on a table for 6. When I'm done adding the condiments I look up to see someone was sitting at my usual table for 2. I was going to get my plate sit somewhere else but notice the cafeteria was empty and this table of 6 was near the dish drop off so to save time I decided to stay. 

Few minutes later I hear this man saying "it's not fair having all that space for one." He comes over places his bag on the chair next to me and on top of my work bag and sits on the next chair. Two other people join him no one acknowledging me at all. I'm sitting at this table with 3 other people I don't know completely being ignored while they talk about personal issues ( someone they know has a mental disability). I know I should have said something before hand. In reality if they would have asked me if they could join me I would have said yes and then been upset with myself and not them but they didn't. 

I finished my meal and while I picked up my plate I said:. " You know usually people ask if someone is sitting there? Or do you you mind if we join you? ...or maybe I wanted to be alone" 

Same man as before: "then you should have moved!" Points to the empty tables

Me: "I was already here, I was already here" repeating myself since he kept saying the same thing. 

Man: "Go get some manners" 

Me:" I'll meet you there" though I don't think he heard me since I was walking away. 

I said all this in a calm manner. Yes I know I was sitting at a table for six but it wasn't busy there where other tables of 6 and 4. Was I in the wrong? 