Something Not To Say To A Liberal

The other day, we got some new pin pads at our Wal-Mart store.  The pin pads at the small device where people swipe their credit/debit cards.
So, a customer comes to me and noticed we had the new pin pads and said so.
I told them it's not always perfect but it runs better than the Obama web site.
Well, they apparently didn't like my response and they told me "That's not funny".
I guess some liberals just don't have a sense of humor or a sense of reality.