Some texts just don't seem to need a response. I just don't reply to those.
Why wouldn't you at least reply to let them know you saw it?
I don't want to waste my time replying if I don't have to
If you are not responding to messages, then people will eventually stop messaging you. It is rude and neglectful not to respond to messages.
So? I shouldn't have to make time for my friends.
You don't have to make time for your friends, but if you really care about them as friends, you should want to make time for them. It's not that hard to send a short text back when they take the time to message you.