I haven't dealt with "mate beggars" often, however I've dealt a fair share as well - heck, I was even one myself at one point or another (I was about eleven, and could hardly type a normal sentence).
The last "mate beggar" I saw was about three months ago. They were very persistent, just as Lexzah descibed but not as bad, and kept bothering me. (I eventually blocked them, but being me, an hour or so later I took them off my block list.)
They kept Whispering me things like "Want to be my mate? I'm literate, realistic, and I can join a group and download a map, just for you. <3" (Their actual grammar and spelling was far from this, but I've made it readable.) I was horribly annoyed, but politely told them to go away.
However, it wasn't like that. They kept Whispering me, over and over. "Aw, babe, why are you upset?" I grumbled to myself before trying to be polite once more by sending them another reply - I couldn't hold my temper, but I made sure not to swear or come off as too rude. "I'm sorry, but I'm not your 'babe', and I'm upset because you keep on badgering me."
They kept on going with calling me 'sweet names', which was honestly creepy since I had no idea how old they were, and it could've been coming from a nine-year-old or a forty-three-year-old for all I know.
After three more Whispers from them, I just blocked them, annoyed, I decided to log off either way. I came back after about an hour, and unblocked them, guessing that they'd leave me be by then - which they had.
-Wolfie