Poker etiquette, suspected cheaters, and advice on where i should go

[thusspokematt]

Hey this is my first time posting on this site. I just learned how to play in january and I have fallen in love with the game. Originally I was just a chess player but I moved back to southern california in january and my friends got me hooked. I just started playing casinos and up until last night I was way up(like 600 dollars) its way up for me considering im only 21 and dont have the budget. But i noticed that since i began playing 3-6 tables alot of older people have said some pretty mean stuff to me. like this one guy said you better watch out or you will wind up on a milk carton box. like i know its money and a little anger is understandable but are there some dos and donts to playing games in the casino? i dont say much, and i dont talk [censored], i just dont want to offend anyone cause two nights ago i took money from this guy then last night he whispered something into this chicks ear at the table i was at and they both looked at me and i knew they were out to get me and my money. so i guess any words of wisdom to share would be great.

another thing i wondered about was what would be appropriate if you suspect people of having signals at the table. is it better to just get up and switch tables or should you notify someone of it. theres no way to prove it and its small limits so i doubt the casinos worry to much about a few little bad apples but its my money and i worry about it. also ive had trouble staying on my game some nights im on fire i play everything right can read what my opponents have and no when to holdem and foldem. othernights im just a calling station. its weird i go from tight aggressive to call call call hoping for mirachles cards on the river cause everyone else is playing so loose and winning pots with like 3-7 off suit so what is the correct way to play when no one folds anything? ive read a few books, play with wilson, i need to know how i would find out what tells im giving off, cause i know some players have been able to read me. so anything u can tell me would be appreicated.

thank you
matt