Bottling up your feelings is never a good idea. While you should always respond rather than react in any given situation, you still need to take the time to process difficult emotions, like anger or sadness. Bottling up your emotions might feel easy now, but it damages your mental health and overall well-being in the long run.
If you notice that something continues to bother you, don’t let it slide, speak up. Holding grudges will always hurt you the most and as the tension and turmoil increases, so does the pressure. Eventually those bottled up emotions explode creating conflict that would have been easier to handle in small doses.