[*TT*]

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weird...

button raises and you fold J3o in the bb (~5:1)

folded to you in the sb and you complete T3o (~5:1)

Is this just because vs the button raise your equity dropped?

I think the button raiser's ASB was about 34% and he was a loose aggressive type (40/17) (2100 hands).

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bingo. As a rule of thumb you want to defend with hands that contain 35% equity vs you opponents range. Vs a SB that is playing 80% or more of his hands your should feel free to play nearly everything, T3o has 37% equity vs his range. The chart below was calculated by Equilator, a great equity ranging tool that is sort of like PokerStove on steroids -

Handrange with greater equity than 35% vs the button:

Player 1: 44+, A2s+, K3s+, Q7s+, J9s+, T9s, A2o+, K6o+, Q9o+, JTo

22+
---
A2s+
K2s+
Q2s+
J3s+
T4s+
95s+
84s+
74s+
63s+
53s+
43s
---
A2o+
K2o+
Q8o+
J8o+
T8o+
97o+
87o
76o