I try to reply to most of the my guest reviews. If they have said something lovely. I want to recognise this and thank them. (glad you liked my lovely garden type comment). If it is negative then I might want to challenge any inaccuracies (fortunately this only happened once with my first horrible guests).
I think hosts who only respond to negative reviews or reviews they don't agree with, just make these reviews stand out more, so this is not a good strategy.
I have to say I cringe when I read some of the overlong diatribes that hosts write to respond to reviews they don't agree with. (there is a huge difference between these and a short, professional response that challenges inaccuracies).
These diatribes (particularly those mentioning private feedback) just make the hosts look rather deranged and can put future guests off from booking with them.