Using 'truculent' suggests negativity and is often used to criticize someone's behavior. The manager's truculent manner upset the new employees.
Pro Tip 2/3
Physical Altercation
'Truculent' can imply a readiness to engage in physical fights, not just verbal ones. During the rough match, the player's truculent actions earned him a red card.
Pro Tip 3/3
Avoid in Friendship
Avoid describing friends with 'truculent' unless you mean they are unpleasantly combative. I was surprised by my usually kind friend's truculent outburst.