Do You Like English Is Easy?

It's funny how on some days you have to teach the same thing 3 or 4 times!
Today it was:
Do you like...?
Would you like...?
I teach in companies and I often hear the question:
Do you like a coffee?
The people who say this are being friendly, so it is difficult to say,
"That's WRONG!!!"
But, it IS wrong!

Why is it wrong? Well, if you say, "do you like coffee?" you are asking for the other person's opinion...e.g.
Do you like classical music?
Do you like dogs?
Do you like reading English is Easy?
So, you want to know what the other person thinks of these things.
If you want to be friendly and offer your poor English teacher a cup of coffee (or tea or beer or more money) you should say:
Would you like...

You can see the difference in the answers:
Do you like English is Easy? Yes, I love it!
Would you like a grammar lesson now? Oh yes, please!!

I would just like to say that I like getting comments and questions so if you would like to comment or ask anything, you can, if you like!