two things pop out at me:
first, if you are having an issue with someone, speak to a general in that clan. I know my clan is intolerant of poor behavior and we deal with it quickly if it is reported.
second: high lvl players are often engaged in activities that make it difficult to help lower level toons. if i leave a snorri camping spot to help someone kill stonefang, i may not be able to get back in time for spawn. likewise, i may be camping wyverns, which is the only way i can get xp anymore. on the otherhand, when i am slumming in stonevale killing bosses for $$, i will always let someone grp in if they are appropriate level. will usually even give them the fragment since i have millions.
If you want a good support structure, you join an appropriate clan for your level. Ancients has a level 130 requirement, not because we dont like lower level people, but because most of us are 170+ and cannot give the proper support to a lower level toon. On the rare occasion we let a lower level in, it is with full understanding of what they can expect as far as boss support. (support in terms of things like frags is a different story as we have a well equipped bank for use by long term loyal clannies).
Civility, Integrity, and the Hermeneutic of Generosity
Akbar: Ranger 220+
Xyn: Mage 170+
Rabka: Rogue 150+
Rabak: Warrior 90+
Clan: Chieftain of Ancients