I love being the only one to dps on trash in raids.
Trash is part of the raid, its not just bosses, stay focused and preform until there is a break, if something is urgent - type in chat and inform your officers/RL like "omg im exploding, brb taking a dump" or "my cat is burning, need to call about my viasat license", they'll be more understanding.
Dont go afk every bit between bosses, since most of the time, there isnt only 1 person doing that, leaving a handful to do what the entire raid should be doing. From start to end, atleast try to be present, you set time out of your scheduel to raid, so do that, and leave FB/mobile/TV until after. Common courtesy while in group content, you set time aside, others did to. dont waste their and expect the same from them.