Both of the linked sources talk explicitly about Zika and not Dengue. What is the source/basis for your claim that they are wrong?
Peer-reviewed research (http://journals.plos.org/plosntds/article?id=10.1371/journal...) states that "80% being clinically asymptomatic during initial infection".
For the 20% of symptomatic people, the WHO lists (http://www.who.int/mediacentre/factsheets/zika/en/) similar symptoms to cold/flu, symptoms you wouldn't necessarily assume are Zika symptoms.
Your friends you know have had Zika are symptomatic. You may have plenty of friends (not to mention yourself) in the much larger asymptomatic bucket.
The "I don't think all the experts are right because anecdotes" attitude just makes you look silly.