If they are consistent and predictable in their expression, there can be some constant erosion of patience there for me but at least I'm aware of what their responses will be and I can mentally prepare.
I think the people who act just fine, then freak out in unpredictable ways, are the hardest to deal with. They are not "safe" to be around. I don't like getting blindsided; large blasts of unexpected emotion freak me out and I need to get some distance.
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...which leads me to be honest and admit that I used to do the "bottle and occasionally explode" thing when I was younger. It was worst when I got married because I could no longer retreat and get space, my spouse wouldn't let up. (Dismissing emotions only works when you're in a place where you're not constantly stuffing more in the bottle.) So bottling emotion no longer worked for me; I was forced to actually address it rather than suppress it. That took me some years to get a handle on.
I think I've only had one real outburst in the last 5-10 years, and it was with someone who aggressively unexpected pursued me and I couldn't get any space from them. They knew how to push my buttons. But before then? Pretty much doesn't happen anymore.