last night i was speaking with a friend about foward im looking to using chemo and then my friend hits me with the bomb shell that poison won't hit both rows of his adjacency

he says that the ruling was that giant adjaceny is for close combat attacks and movement only, so no poison, plasticity or defend (micro-lad)...is that right? it sounds right....but i hate to think that chemos plasticity and poison don't work that way

With the current wording of the Giant rules, that is exactly right. From the Icons rule book (page 30, under 'Giants'):

A giant character is adjacent to standard-sized characters (those with the [starburst] damage symbol), big characters, and other giant characters when those characters are up to two squares away for movement and close combat attack purposes, regardless of the other character’s elevation or flight mode, but an elevated giant character is not adjacent to a grounded standard-sized character. Standard-sized and big characters are adjacent to giant characters up to two squares away for movement purposes but not for close combat attack
purposes. A standard-sized or big character must be within one square of a giant character to make a close combat attack against it. Characters two squares away from a giant character are considered not adjacent for ranged combat purposes.

Since Poison is not movement or (the Giant's) close combat, it won't activate on characters that are two squares away from the Giant.

so same goes for plasticity, defend, enchancement, and the TAs of sharing adjacent stats (ss and defenders etc.) ??

cause chemo got a lot less interesting

If it ain't movement or (the Giant's) close combat, then it won't work.

Defend -> not movement or close combat
Enhancement -> not movement or close combat
Most TAs -> not movement or close combat
Plasticity -> is used during movement (specifically, breakaway rolls). this is ok.

Just use that formula for determining if something would work for Giants/character interaction with Giants.

But giants cannot prevent you from using support unless they are 1 square away from you. That helped me in a game tonight. Alternatly, you cannot use support on your giant unless you are 1 square away from him as well.