Intrusive

[Ernesto]

Something that forcibly imposes itself on you at a time when you dont want it.
Example: [Facebook Messengers] extremely annoying [popup] notification that superimposes itself over everything else you are doing on your smart phone and has to be [uninstalled] in order to stop it.

[Agnes]

Causing disruption or annoyance through being unwelcome or uninvited.

[Julene]

affecting someone in a way that annoys them and makes them feel uncomfortable: