Some people have particular triggers that make snoring worse. Snoring HQ also notes that possible triggers can include allergy problems, a cold or other respiratory infection, use of alcohol or eating a heavy meal too close to bedtime. If you can identify triggers, you can sometimes find ways to avoid some snoring issues and this can help you both get a better night's sleep.
In short, if your partner has a problem with snoring and you are wanting to talk to him/her about it, keep these tips in mind. They can lead to a productive conversation that can improve the situation for you both and avoid pointless and potentially hurtful arguments.