No. Because that would be critical of the UAE government position and could be considered a risk to national security.
If the OP openly opposed slavery, in theory that could be viewed as a threat to the UAE authorities. If the OP said anything negative about working conditions, this could be viewed as a threat. It might be viewed as inciting views against the authorities.
The whole point is that you cant question the law or the image of the UAE in UAE. You can't have an opinion that opposes policy publicly because you may undermine and destabilise that policy or position. Or more importantly, be perceived to be doing so (even if that wasn't your intention) - for which you might be arrested.
You can't actively criticise or protest a law, because there isn't free speech. We don't comprehend this in the UK because we take it for granted that we can.
This thread is a farce, because for all the OP saying they are honest, if they are in the UAE they aren't free to be honest so whatever they say can't be trusted as honest! We need to be fully aware of this. They may well be honest think that but they may not and there may be a very good reason for them to be dishonest (including potentially saying 'yay slavery, whilst actually being opposed to it).
We know they are at risk of arrest if they say anything other than the shiny polished positive image of UAE or are critical of UAE in anyway though.
And that's why this thread is ridiculous because no matter what we ask, this point is behind everything the OP may say.