Opinions?

Tell me if I'm wrong to be annoyed by this. My son was poorly with flu I took him to the doctor, the doctor sends us to hospital to get checked out. I text my husband to let him know what's going on and about a half hour later he messaged to say that his friend who rarely visits is down and he's going out for a drink. I had our two year old with us as well, we were there for six hours and he didn't offer to come get the toddler/ ask if we needed anything bringing. We got home around nine and he came in from the pub well after midnight. He messaged occasionally to see what was happening but I'm still irritated...