It may not be laziness, but it is definitely entirely lacking in empathy.

Using AI reflexively assumes that you have a tool that they do not, or that they are not motivated or smart enough to use before coming to you. LMGTFY is directly a laziness-rebuff for this reason - everyone has and already uses google. Why would you assume that your coworkers are lazy or not smart as a first step in any interaction?

There are millions of reasons a genuine conversation should happen when a coworker reaches out, and many of these, if exercised in good faith, would be a trust-building interaction. LMGTFY and AI copypasta both are snide, cost-free rebuffs of a coworker who approached you with a question - and that's just shit culture if it becomes common.