I wont see anyone who cannot understand a simple sentence or who I cannot understand.  I even refuse deaf people who don't do BSL as communication would be impossible with them
The one time I broke this rule was New Years eve when I saw a deaf client who did not know BSL and I ended up rather badly beaten up

I see a lot fo men who do not speak English as  first language but they can speak enough to understand and be understood

Chrissie, yes I am the same.

Dani, I am really sorry to hear that happened to you. I once had a deaf client give me all sorts of abuse via email and text because I wouldn't see him as he took massive offence (even although I was very polite and sensitive about the whole thing as I didn't want to upset him) saying I was discriminating because of his disability, made me feel really bad but it was really because I need to speak to someone and understand them before inviting them into my home.

I suggested he visited a parlour or an agency but he hold me to go fuck myself.

xx

Well till today I didnt let poor English get in the way if I could manage to get the guy to my door via the directions and a multitude of amusing phone conversations but after the one who turned up today I have finally had enough. Poor english means no booking. I told  him   he had to be clean, he had asked for sucking without a condom, he said yes yes when I said clean, very clean penis, he arrived and he absolutely stunk to high freaking heaven. I have never ever smelt a smell like it, as if he was smeared with extreme BV and sour piss. He either didnt understand what I meant or he calls that clean, either way, he want getting in. From now on only people with a certain level of English are going to be allowed bookings because at least that way I know they understand me when I say they have to be clean. I have had enough with poor english speakers, there is always some sort of issue.

I had a lovely man from Burma whose spoken English wasn't very confident but read and understood well enough to know what reply to attempt, it made for a quieter booking during the act but one without misunderstandings. So far my only experience of a foreign client and hope to keep them positive wherever the guy is from 

I've had a few who literally cannot communicate with me (cue lots of gesticulating on my part) and a load that can barely communicate.
To be honest I don't really mind either, with the latter I just talk at them for like 20mins with no reply, but whatever it's easier than some jobs
And the ones who can't communicate at all don't tend to hang around after so fine by me

ETA I work for an agency so don't talk on the phone

Also it's not always that hard to communicate if you will or won't do something they want without words, I've always gotten by so far