Speaking of Southern accents, when I went to Rochester NY, just about everyone commented on my Southern accent (I grew up in VA) and I wondered how much of it was deaf speech and how much of it was Southern accent.
On the other hand, I still have trouble with heavy accents. It does't matter if it's accents from other parts of USA or Foreign accents. I used to have a co-worker who had a heavy Boston accent. She'd say things like I pached my cah in the paching lot. What she actually said was she parked her car in the parking lot.
Earlier this spring, I encountered a woman with a heavy Indian accent. My doctor also has an Indian accent but not as heavy as that woman. It was nearly impossible to understand her.
I used to speak with a Maine accent when I was six. I would say things like drawers this way: drawer as in how you pronounce draw with the er suffix added to it. That's because my 1st grade teacher who also was my speech teacher was from Maine.