Palestine solidarity demos have continued happening in Glasgow and across Scotland, especially in light of the Israeli forces' violent attacks on and eventual interception of the global Samud flotilla (and kidnapping of activists) which was an attempt to deliver humanitarian aid to Gaza.
There's absolutely no contradiction between being opposed to/ critical of the ongoing genocide being carried out against Palestinian people, and being opposed to/ critical of anti-semitic attacks being carried out against Jewish people. The root cause of both is racial hatred and prejudice.
I note that only three people were actually killed in Manchester, and only one of these was killed by the perpetrator of the attack. Many thousands of people have been deliberately killed by the IDF in Palestine, many of them children (disproportionately targeted, along with health workers and journalists), and many more are currently starving, with barely any access to shelter, clean water, medical facilities, education etc etc.
If you're not outraged about this, you're part of the problem. Pretty much every Jewish person I know has been heavily involved in campaigning against the actions of the Israeli state, and for the rights of the Palestinian people. Some of them have been labelled as 'anti-semitic' and 'terrorist' by the UK police for doing so.