Any positive comment is fine, unless you are retorting to a negative one in which case you need to explain more.<p>If making a negative comment you should explain, i.e. &quot;I think this is bad because ...&quot; rather than &quot;This is bad.&quot;. If you have a valid point you are helping by raising it.<p>Similarly when retorting to a negative point with a positive view, &quot;I disagree because ... &quot; is good but just &quot;You are wrong.&quot; simply unhelpful noise.<p>So feel free to provide positive encouragement when you think something is awesome!