This.Part of the game, if you're not mentally strong enough to handle that then you're probably not a very good player anyway
Sportsmanship has been dead in this country for at least 35 years. As a coach I demanded it of my players as a matter of personal dignity and respect for the game, but we always taught the importance of a strong mental game and focus, not just for performance in crucial situations but as a 'defense against the dark arts'. We expected and used 'trash talk' as a reminder to focus on key fundamentals.
If you have to ask the question..."Is this poor sportsmanship?"....well, you already know the answer.