Sorry for the last riddle
But this time I'll try not to fiddle
The important lines will begin now
This time it'll be better I vow
The prefix is where mad white workers work
With strange liquids that will make you berserk
The suffix sounds like how you walk through a wall
Drop one of 4 letters and you will have appall
The infix is best known as letter 4 times 2
Cause of a male stereotype I wish I never knew
How am I talking though? Don't bark up a storm as to why...
All you need to worry about is... what am I?