Alexander wasn't a fan of people who defied him. The Spartans wouldn't join him because they refused if they couldn't lead the army so after a major battle he sent back 300 suits of captured armor as spoils of war to the Parthenon with this inscription:

‘Alexander and the Greeks, except the Lacedaemonians(Spartans), set up these spoils from the barbarians dwelling in Asia.’

Have to respect a pretty good diss, the 300 suits of armor is an obvious reference to Thermopylae